戊唑醇对苹果斑点落叶病菌及轮纹病菌的毒力和药效评价

Evaluation of Fungitoxicity of Tebuconazole against Alternaria mali and Physalospora piricola on Apple in Laboratory and in Field

摘要: 采用菌丝生长速率法测定了戊唑醇对苹果斑点落叶病菌Alternaria mali和苹果轮纹病菌Physalospora piricola的毒力并进行了田间药效试验。室内测定结果表明:戊唑醇抑制苹果斑点落叶病菌菌丝生长的EC50和EC90值分别为0.034和0.587 μg/mL,抑制苹果轮纹病菌菌丝生长的EC50和EC90值分别为0.019 和0.394 μg/mL。43%戊唑醇悬浮剂61 ~86 mg/L(5 000 ~7 000倍液)对苹果斑点落叶病的防效为84.6% ~88.8%,108 ~143 mg/L(3 000 ~4 000倍液)对苹果轮纹病的防效为73.8% ~86.4%,且该药剂在本试验剂量范围内对苹果树安全。

Abstract: Fungitoxicity of tebuconazole against Alternaria mali Roberts and Physalospora piricola Nose was assessed by mycelial growth rate method.And the field trial efficacy of 43% tebuconazole SC in controlling apple Alternaria blotch and apple ring rot was evaluated.The results showed that the EC50 and EC90 values of tebuconazle to A.mali were 0.034 and 0.587 μg/mL,and that to P.piricola were 0.019 and 0.394 μg/mL,respectively.The efficacy of 43% tebuconazole SC was 84.6% ~88.8% in controlling apple Alternaria blotch caused by A.mali at the rate of 61 ~86 mg/L (diluted by 5 000 ~7 000-fold),and that was 73.8% ~86.4% in controlling apple ring rot caused by P.piricola at the rate of 108 ~143 mg/L(diluted by 3 000 ~4 000-fold),respectively.The study also showed tebuconazole was safe to apple trees at the tested dosages.